Also see the handout entitled Variation of Parameters.

Page 165, problems:

• 1, 3, 5, 11, 12, 13, 15, 17,

• 21, 27

Answer to 12:
y = c₁e^x + c₂xe^x – ½ e^x ln(1+x²) + xe^x tan^–1x

Remember that unlike undetermined coefficients, here you may have to simplify your solutions.

See these examples:

1. Example 1
2. Example 2
3. Example 3
4. Example 4

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